Finding the Fourth Proportional to 99.77, 136.85 and 93.89

Step by Step Solution

1. Step 1: Write the proportion equation
   99.77 : 136.85 = 93.89 : x
2. Step 2: Convert to fraction form
   99.77/136.85 = 93.89/x
3. Step 3: Cross multiply
   99.77x = 136.85 × 93.89
4. Step 4: Simplify right side
   99.77x = 12,847.69
5. Step 5: Solve for x
   x = 12,847.69/99.77
6. Step 6: Final answer
   x = 128.78